Algorithm aids drive control
A
LG Motion product story
Edited by the Engineeringtalk editorial team
Apr 25, 2006
Drive with a sensorless motor commutation system for brushless DC motors provides simplified control and improved performance when compared with servomotors with traditional Hall-effect feedback.
Agile Systems' DPDLite drive with a sensorless motor commutation system for brushless DC motors provides simplified control and improved performance when compared with servomotors with traditional Hall-effect feedback.
Available from LG Motion, the compact single board design can be mounted either inside the motor housing or separately to provide two-wire power connection with full PID closed loop torque and velocity control.
Using an algorithm based on motor phase inductance measurement that allows the motor to start unidirectionally without start-up delay, the drive detects rotor position from stand still through its speed range for control of fans, pumps, compressors, centriguges and other speed and torque based applications.
With higher efficiency and high power-to-size ratio, brushless DC motors are increasingly replacing traditional single- and three-phase AC motor technologies in non-servo applications.
The sensorless commutation system offers advantages over Hall based motors in terms of increased reliability and performance with reduced motor and wiring costs.
The drives are available for motor voltages between 12 and 30V DC with continuous current ratings to 18A and peak ratings to 30A.
Full over and under voltage, current limit and over temperature protection is included and the drive has digital inputs for direction and torque and velocity selector and a 0 to 5V DC analogue control input.
Application set-up is via DP-D software, which handles motor and I/O set-up, with configuration, full diagnostics and help system.
Used with Agiles' DP-Win tuning tools and graphical analysis software, DP-D speeds motor commissioning and installation via an RS232 connection to the drive.
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